Danfoss VLT 8000 AQUA series Operating Instructions Manual

Also see for VLT 8000 AQUA series: Instruction manual Operating instructions

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Danfoss VLT 8000 AQUA series Operating Instructions Manual Manual pdf 14 page image

VLT ® 8000 AQUA■ LON - Local Operating NetworkLonWorks is an intelligent fieldbus system whichimproves the possibility of decentralising control,as communication is enabled between individualunits in the same system (Peer-to-Peer).This means that there is no need for a big main stationfor handling all the signals of the system (Master-Slave).Signals are sent direct to the unit that needs themvia a common network medium. This makescommunication much more flexible and the centralbuilding state control and monitoring system can bechanged into a dedicated building state monitoringsystem whose task is to ensure that everything isrunning as planned. If the potential of LonWorks isfully utilised, sensors will also be connected to thebus, which means that a sensor signal can quicklybe moved to another controller. If room dividers aremobile, this is a particularly useful feature.■ DeviceNetDeviceNet is a digital, multi-drop network, basedon the CAN protocol, that connects and servesas a communication network between industrialcontrollers and I/O devices.Each device and/or controller is a node on thenetwork. DeviceNet is a producer-consumernetwork that supports multiple communicationhierarchies and message prioritization.DeviceNet systems can be configured to operate in amaster-slave or a distributed control architecture usingpeer-to-peer communication. This system offers asingle point of connection for configuration and controlby supporting both I/O and explicit messaging.DeviceNet also has the feature of having poweron the network. This allows devices with limitedpower requirements to be powered directly fromthe network via the 5-conductor cable.■ Modbus RTUMODBUS RTU (Remote Terminal Unit) Protocol isa messaging structure developed by Modicon in1979, used to establish master-slave/client-servercommunication between intelligent devices.MODBUS is used to monitor and programdevices; to communicate intelligent deviceswith sensors and instruments; to monitor fielddevices using PCs and HMIs.MODBUS is often applied in Gas and Oil applications,but also in building, infrastructure, transportation andenergy, applications are making use of its benefits.MG.83.A2.02 - VLT is a registered Danfoss trademark14